Stovepipe damper for check draft



E. A. POUND STOVEPIPE DAMPER FOR CHECK DRAFT' AIR ADMISSION Flled May '7 1945 May 11, 1948.

Patented May 11, 1948 UNITED smrs page TENT STOVEPIPE DAMPER FOR CHECK DRAFT AIR ADMISSION Claims. 1

This invention relates to a furnace damper construction and more particularly to an improved damper valve assembly.

An object of thisinvention is to provide a damper valve which is economical to manufacture and which may be readily installed in existing furnace systems at a. minimum of cost.

Another object of this invention is to provide an improved damper construction which when used in conjunction with existing furnace smoke pipes will greatly reduce the loss of heat through the chimney.

Another object of this invention is to provide a damper construction, which when connected with a furnace smoke pipe will enable fresh air to be drawn into the smoke pipe by the chimney draft thereby eliminating the necessity of withdrawing heated air from the building.

Yet another object of this invention is to provide a damper construction which will eliminate the need, in the regulating of a chimney draft, of having to withdraw heated air from the basement or other portions of the building being heated.

In accordance with the general features of this invention there is provided in a damper control structure for a furnace including a smoke pipe connected with a chimney, a pipe connecting a portion of the smoke pipe to the exterior of the building for supplying fresh air to the smoke pipe and including two abutting sections of the pipe and a damper valve interposed between the ends of the pipe sections for controlling the flow of fresh air into the smoke pipe to regulate the draft of the furnace.

A further feature of the invention relates to the provision of a damper valve which can be bodily inserted in a furnace pipe line with a minimum of changes therein, and which includes a housing ring, a valve disc therein and a shaft pivotally supporting the disc in the ring and with its ends extending beyond the periphery of the ring into opposite slots provided in the pipe.

Another feature relates to the manner in which the damper valve assembly of my invention is held at adjoining sections of pipe by a clamping ring lapping the abutting ends of the. pipe on the exterior thereof.

Other objects and features of this invention will more fully appear from the following detailed description taken in connection with the accompanying drawings which illustrate a single embodiment thereof and in which Figure 1 is a somewhat diagrammatic view,

abutting pipe housing my damper valve and drawn on an enlarged scale; and

Figure 3 is a cross-sectional viewtaken on the line III-III of Figure 2 looking in the direction indicated by the arrows.

As shown on the drawings:

I have designated generally by the reference character II) a conventional furnace supported on a basement floor ll of a building and below the first floor l2 of the building. A conventional smoke pipe M for the furnace extends through the building wall It and is in communication with the interior of a usual chimney iii.

In such a structure, it has heretofore beenthe practice to modify the draft by a-damper which permits of the introduction of air from the basement in the smoke pipe Hi. This, as pointed out before, is quite costly since it results in the chimney draft withdrawing substantial amounts of warm air from the building. I propose in lieu thereof to provide a separate pipe line l6 having one end in communication with the smoke pipe IQ and having its other end extending through an opening in the building wall I3 for communication with the exterior atmosphere. Thus fresh air can pass through the pipe it into the smoke pipe M in response to the desired draft conditions.

The control of the flow of fresh air through the pipe It in the smoke pipe H5 is effected by a damper valve assembly embodying the features of my invention and designated generally by the reference character l8.

This damper valve assembly is disposed sub.- stantially at the junction of the abutting ends of two pipe sections Ilia and Nib comprising joints of the pipe line Hi. It includes a ring l9 having a diameter such that it can be bodily inserted endwise in and tightly fitted within one of the pipe sections, such as the pipe section lfib. This ring may be made of any suitable material, although I preferably propose to make it in the form of a die casting, and contemplate that it may be cast of white metal or the like.

The opposite faces of this cast ring l9 are recessed at 2B and. 2! to provide inclined valve seat shoulders 22-23 on opposite sides of the medial plane of the ring. These inclined shoulders 22-23 are so formed as to be in a common plane inclined slightly relative to the normal plane of the ring. This arrangement is such that of the shaft 25 are journaled in the ring i9 and extend beyond the ring at both sides through the oppositely disposed slots 21 formed in the end section lGb.

Suitably secured to one of the exterior ends of the shaft 25 is a weighted lever 28 having an adjustable weight 29 thereon. The free end of the lever is connected by means of a chainor rope 30, as shown in Figure :1, trained over suitable pu1ley,..to.=a regulating or erating device 3i which may be on the firstfloor of .the building. By pulling on the chain 30 it is possible to regulate the. position of the. dampervalve .24 arid-a further adjustment can be efiected by varying-the position of the weight 29 on the lever '28.

In accordance .with the novel features of my invention, Iemployn clamping metal band '32 for holding the two pipe sections Ilia and Nib together in alignment and .alsofor holding the ends of. the shaft 25in the bottoms'oftheopposite slots 21; Thatis to say, an edge of the band, asshown in dottedlines in Figure 2, engagesthe extremities of the shaft .topress thcsame firmly against the bottoms of .theslots 21-21. The endsioi the'ban s, as is customaryin uch clamps ing' bands, are offset and are detachablyiastened togetherby means ofa screw '33 as shown in Figure 3.

Now it is clear'that. a minimumxamountof chansein existing f nace smoke pipes as well as aniinimuin amolll'illjoflabor is involved .in the application of the damperyalve assembly of. my inventionthereto.

,rirstaiholemustibe cut inthe sm e pe 4 forlreceivinganend.or the p pe l nelfi; and the Wall 43. .rnust beprovided with .a hole leading o the c xterior of the building for receivin the oth r and oi? the pipe ine.

preferablyapply my damper valve assem ly to the junction of theadioining ends of pipe s ctions I60; and I 6b, as I can insert it there with acminim m amount. of labo and part In fac the only modification I have to make in the existinggalvanized pipe I6!) is to out two diametfinally Oppo te S 2 .21 in an end. of the pipe. Then I slide the ends of the shaftZE into the slots and position the pipe sections 16a andifib in alignment. Thereafter I applyithe clamping band .32 to the aligned ends of the pipe sections Ilia; and iiib-and usethatclamping ring, .as indlcated before, to hold the sections together and to :also hold the ends of the shaft 25 tightly in position in the slots 21.

'flhereafter the chain or rOl eSil is connected to the damper lever 28 and to the manual regula tor 3|:so that the damper can be regulated in accordance with the requirements of the particular house being heated.

"My. invention thusena cs. the chimn y. draft to withdraw its, requirement .of air from, the exterior; of'the building. rather than taking warm air fromthe building.

'I" clalm asmy invention:

1. In a damper structure for a furnace including abutting pipe sections one of which has its ends slotted on opposite sides, a valve inserted in said slotted pipe end including a ring, a valve disc and a shaft for pivotally supporting the disc in the ring, said shaft having its extremities beyond the periphery of said ring extendi g into the slots and a clamping ring lapping thflabutting ends'of said pipe sections on the e thereof.

erior 1i In a damper structure for a furnace includping abutting pipe sections one or" which has its .endslslotted on opposite sides, a valve inserted in said slotted pipe end including a ring, a valve disc and a shaft for pivotall supporting the disc in thering, said shaft having its extremities be- --yond the periphery of said ring extending into the-slots and a clamping ring lapping the abutting ends of said pipe sections on the exterior thereof, said clamping ring having an edge abutting the, external ends of said shaft to retain the same in the ends of said slots.

3. In .adamper structure for a furnace includingabutting pipe sections one of which has its ends slotted onopposite sides, a valve inserted in said slottedpipe end including a ring, a valve discand a shaft for pivotally supporting the disc in. the ring, said shaft having its extremities be-. yond the periphery of said ring extending into the slots and a clamping ring lapping the; abutting ends of said pipe sections on theexterior thereof,.,a-nd a weighted operating lever connected to one of-said shaft ends on the exterior ofsaidpipe sections.

- valve disc therein and a shaft for pivotally supporting the disc in the ring, said shaft having its ends extending beyond the periphery of said housing ring and into the slots, and av clamping ring lapping the abutting ends of said pipe section on the exterior thereof, said housing ring comprising a casting with opposite faces recessed to provideinclined valve seat shoulders disposed in a common plane inclined relative to the normalplane of the housing ring.

5. In a damper structure for a furnace including aligned abutting pipe sections, one of which has its end slotted on opposite sides, a valve comprising a disc-like body portion insertable in said slotted pipe end, and diametrically opposed projecting shaft portions respectively eXtending into said slots, and a clamping ring lapping the abutting endsof said pipe sections, said clampin ring having an edge abutting said shaft portions to retain the same in the ends of said slots.

EDWARD A. POUND. v

REFERENCES crrnn The following references are of record in. the

-file'of this patent:

1,798,122 Martin Mar. 2 i, 193i; 

